Abstract
Observations made by the NASA Cyclone Global Navigation Satellite System (CYGNSS) of inland waterways can be used to resolve changes in water boundaries on time scales from days to weeks to months. An example of change on a daily time scale is the response of river width to rapid changes in stream flow rate. An example of change on a weekly time scale is the flood inundation caused by a land falling hurricane. And an example of change on a monthly time scale is the expansion and contraction of a major river delta due to seasonal monsoon rains. CYGNSS measurements of each of these phenomena are presented, and related considerations and implications of its measurement capability are discussed.
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